Re: [考古] 今年的成大考題 @@
※ 引述《venwhah (昆)》之銘言:
: 以下是今年的成大微積分部分考題
: 只有抄這幾提出來 (唉 變炮灰 囧 )
: 大概是看中文的題目慣了 有些都不會算
: 一整個不知道該說什麼
: 有會的人就幫忙解一下吧
: 非常感謝
: 1.Use the method of Lagrange Multiplier to find the max value of the fuction
: 3 2 2 2
: f(x,y,z)=x+3y-2z define on R subject to the constrain x + y +z =14
G(x,y,z,λ) = x+3y-2z + λ(x^2 + y^2 +z^2 =14)
Gx = 1 + 2λx = 0..................同乘yz
Gy = 3 + 2λy = 0..................同乘xz
Gz = -2 + 2λz = 0.................同乘xy
得 -2λxyz = yz = 3xz = -2xy.........得 y = 3x = (-3/2)z 代回原條件
(x,y,z) = (1,3,-2).............. 14.....max
= (-1,-3,2)............. -14.....min
各位有考成大的高手 是算這個答案嗎? 有錯請指正!
: 2.Let f be a real valued fuction defined on R with f"(x)>0
: for all x ,show that f(x)≧f'(0)+f(0) for all x
: 3. x
: e ㏑(x+e) 1
: Let f(x)=∫ ---------------- dx defined on (-1,∞)
: 1 4 2
: √(x + x +5)
: (a)show that f is a strictly increasing fuction
: -1
: (b)find (f )'(0)
: 4. 1 n 3i 7 3i 4
: lim --- Σ √(-----) +(-----)
: n->∞ n i=1 n n
: 5.Find area of the region Ω bounded by the curve
: 2 2 2
: x -4xy+4y -2x-y-1=0 and y =---
: 5
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